Recommended Dietary Allowance for protein in individuals who like to workout

January 25th, 2016 by

Protein intake is an interesting topic we talk about from time to time on this page. One of the reasons why it’s interesting is that we’re consistently finding that the Recommended Dietary Allowance for protein intake (0.36 g/lbs.) is too low for those who like to workout. In fact, I’ve written numerous recaps on studies, which have shown this. So keeping with tradition, here’s another one:

In a 4-month study published in the Journal of Nutrition, researchers split 48 women between the ages of 40-56 into 4 groups. All groups consumed a calorie-reduced diet, which provided about the same amount of total calories per day with 30% of that energy coming from fat. One group consumed the RDA for protein with the remainder of their calories coming from carbs. So they had a lower protein and higher carb diet. Another group consumed twice the RDA for protein with the remaining calories coming from carbs. Essentially, this was a higher protein and lower carb diet. The two other groups basically did the same thing. That is, one group had a low-protein, high-carb diet while the other had a high-protein, low-carb diet. However, both of these groups also did cardio and weight training throughout the week.

Before and after the study, the researchers measured the body weight, fat mass and lean mass (e.g. muscle) of the subjects. What they found was that all groups lost weight. However, those who consumed twice the RDA for protein lost more weight and fat mass. Also, the group who worked out and consumed a higher protein intake lost more weight and fat, while preserving more lean mass.

Therefore, it would appear, once again, that those who are looking to lose fat are better off consuming a higher protein intake and working out. That being said, as a general guideline, we at LBC recommend consuming 0.8-1.2g per pound of body weight a day.

 

Dietary Protein and Exercise Have Layman, DK et al. (2005) Additive Effects on Body Composition during Weight Loss in Adult Women. J Nutr. Aug;135(8):1903-10.